Antichiral states in twisted graphene multilayers

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2020-11-05
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Language
en
Pages
8
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PHYSICAL REVIEW RESEARCH, Volume 2, issue 4
Abstract
The advent of topological phases of matter revealed a variety of observed boundary phenomena, such as chiral and helical modes found at the edges of two-dimensional (2D) topological insulators. Antichiral states in 2D semimetals, i.e., copropagating edge modes on opposite edges compensated by a counterpropagating bulk current, are also predicted, but, to date, no realization of such states in a solid-state system has been found. Here, we put forward a procedure to realize antichiral states in twisted van der Waals multilayers, by combining the electronic Dirac-cone spectra of each layer through the combination of the orbital moiré superstructure, an in-plane magnetic field, and interlayer bias voltage. In particular, we demonstrate that a twisted van der Waals heterostructure consisting of graphene/two layers of hexagonal boron nitride [(hBN)2]/graphene will show antichiral states at in-plane magnetic fields of 8 T, for a rotation angle of 0.2∘ between the graphene layers. Our findings engender a controllableprocedure to engineer antichiral states in solid-state systems, as well as in quantum engineered metamaterials.
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Denner , M M , Lado , J & Zilberberg , O 2020 , ' Antichiral states in twisted graphene multilayers ' , PHYSICAL REVIEW RESEARCH , vol. 2 , no. 4 , 043190 . https://doi.org/10.1103/PhysRevResearch.2.043190